Help needed with aristo 1212 cold light

**Tin Can** · 4-Jun-2019, 17:22

For advice on the trailer you need another forum. This one is the best. I posted a little there. But many more will assist.

NO DRYWALL Plywood!

http://www.tnttt.com/

http://www.tnttt.com/viewforum.php?f=42

Originally Posted by Ethan

My plan (we'll see if it comes to fruition at all) is to frame the inside walls of a trailer and put dry wall in, both so it can be insulated, and to give stronger mounting points. Also might use rubber shock absorbers when mounting equipment, to add another layer of protection.

**Ethan** · 4-Jun-2019, 17:26

I was imagining it just like house construction, but yea, thinking about it, drywall wouldn't fair to well in a trailer

**Tin Can** · 4-Jun-2019, 17:30

https://www.largeformatphotography.i...=1#post1055834

http://www.jbhphoto.com/wp-content/u...Printing03.pdf

https://www.largeformatphotography.i...=1#post1419311

**Tin Can** · 4-Jun-2019, 17:35

https://www.largeformatphotography.i...=1#post1351234

Please read these links. Most of us have.

You need to Google search far and wide.

The links I have posted are only a hint...

**Ethan** · 4-Jun-2019, 17:58

thanks for the sources, since you've worked with LEDs as a light source, can you shed any light on how much light is needed for 8x10 enlargements? My calculations based on scaling up a 6x6cm enlarger said 30,000 lumens were required, but those threads indicate that one can get by with a lot less.

**Tin Can** · 4-Jun-2019, 18:16

I never did actual lumen measurements. I simply used a spot meter to check for even light. Then did test strips with actual paper.

But one of my links to tests i had way too much LED power and had to use multiple diffusers and turn the lamp down to 25% to get 15 second exposures with a 240mm at f16 onto 16X20 paper which I wouldn't have remembered, but I read it tonight on one of the posts.

I have no plans to put an a big enlarger in my trailer. Maybe a sturdy and old 35mm one.

I may test with these things again next winter. Now it's time to get outside... https://www.amazon.com/s?k=led+light...f=nb_sb_noss_1

My goal is 8X10 contact prints using a plain old light bulb.

Originally Posted by Ethan

thanks for the sources, since you've worked with LEDs as a light source, can you shed any light on how much light is needed for 8x10 enlargements? My calculations based on scaling up a 6x6cm enlarger said 30,000 lumens were required, but those threads indicate that one can get by with a lot less.